<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        var arr = [];
        for (var i = 0; i < 10; i++) {
            arr.push(Math.floor(Math.random() * i));
        }
        console.log(arr.toString());// 0,0,1,2,0,0,1,6,5,2
        arr.sort();
        console.log(arr.toString());// 0,0,0,0,1,1,2,2,5,6
        arr.reverse();
        console.log(arr.toString());// 6,5,2,2,1,1,0,0,0,0
    </script>
</body>
</html>